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Undelivered Mail Returned to Sender( centos mail server problem)

hello everybody
i have a mail server which is running on centos after the installation it has work for some time now, but there is a problem now if you send a mail it will reply back with this message (Undelivered Mail Returned to Sender). i restarted the system and when it was loading i saw postfix fail. can somebody help to fix this please.